chicken-install —
    download and install extension libraries for CHICKEN
    Scheme
  
    chicken-install | 
    [OPTION ...] [NAME[:VERSION]
      ...] | 
  
chicken-install downloads, compiles and
    installs a prepackaged extension library from sources. If no extension name
    is given on the command line, then any existing
    egg
    descriptions in the current directory will be executed in unspecified
  order.
The program accepts following arguments:
  -h,
    -help 
  - Show usage and exit.
 
  -version 
  - Show version and exit.
 
  -v,
    -verbose 
  - Print extra information during installation.
 
  -force 
  - Install without confirmation, even if versions don't match.
 
  -k,
    -keep 
  - Keep temporary files.
 
  -s,
    -sudo 
  - Use an external program to elevate privileges for filesystem operations.
      The program defaults to
      sudo(8)
      but can be overridden with the 
SUDO environment
      variable. 
  -r,
    -retrieve 
  - Just retrieve the egg, don't install it (giving
      
-r more than once implies
      -recursive). 
  -recursive 
  - If
      
-retrieve is given, also fetch
      dependencies recursively. 
  -dry-run 
  - Do not build or install, just print the locations of the generated build
      & install scripts.
 
  -list-versions 
  - List available versions for the given eggs.
 
  -purge 
  - Remove cached files for given eggs (or purge cache completely).
 
  -host 
  - When cross-compiling, only compile extensions for host.
 
  -target 
  - When cross-compiling, only compile extensions for target.
 
  -test 
  - Run included test cases, if available.
 
  -n,
    -no-install 
  - Do not install the egg, just build it.
 
  -no-install-dependencies 
  - Do not install dependencies. Note that this option may result in build
      failures due to missing extension libraries.
 
  -u,
    -update-db 
  - Update export database.
 
  -repository 
  - Print path used for egg installation.
 
  -override
    filename 
  - Override versions for installed eggs with information from
      filename.
 
  -from-list
    filename 
  - Install eggs listed in filename, which has the same
      format as
      chicken-status(1)'s
      
-list output. This option
      may be given multiple times. 
  -cached 
  - Only install eggs from cache, do not download.
 
  -l,
    -location directory 
  - Get egg sources from the given directory. May be provided multiple times.
      Locations specified on the command line have precedence over the ones
      specified in setup.defaults.
 
  -feature,
    -D name 
  - Register feature name, usable as a condition in
      cond-expand clauses.
 
Following environment variables change the behaviour of
    chicken-install:
  CHICKEN_EGG_CACHE 
  - Location where eggs are retrieved and built.
 
  CHICKEN_INSTALL_PREFIX 
  - The path prefix for all target files, as given when building the system.
      Use this variable to override where programs, include files and additional
      data files shall be intalled.
 
  CHICKEN_INSTALL_REPOSITORY 
  - The path where extension libraries are installed. Defaults to the package
      library path selected during configuration (usually
      $prefix/lib/chicken/<binary-version>). Note that this variable takes
      precedence to CHICKEN_INSTALL_PREFIX.
 
  SUDO 
  - The command to execute when using 
-s flag in
      command. If not provided, defaults to
      sudo(8). 
  - $XDG_CONFIG_HOME/chicken/setup.defaults
 
  - User specific setup.defaults file. (
      
$XDG_CONFIG_HOME defaults to
      $HOME/.config ) 
  - $prefix/share/chicken/setup.default
 
  - System-wide setup.defaults file.
 
  - $XDG_CACHE_HOME/chicken-install/
 
  - Default directory for cached eggs. (
      
$XDG_CACHE_HOME defaults to
      $HOME/.cache ) 
The chicken-install utility exits 0 on
    success, 2 if the user aborted an operation, 3 if it was invoked with no
    explicitly given egg names and no *.egg files could be found in the current
    directory, and >0 if any other error occurs.
Install ‘regex’ egg as root user:
# chicken-install regex
Install an egg as an normal user but using
    sudo(8):
$ chicken-install -s
  regex
Install an egg as an normal user but elevating privileges with
    different program, such as OpenBSD
    doas(1):
$ SUDO=/usr/bin/doas chicken-install
  -s regex